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Preferences > Validator Settings

In this preference settings, you can activate only the tests you need. By default, all error and warning tests are active.

These are the validations performed by the validator:

NOTE: Links in third column lead to video explanations

	Validation	What is checked	Textual help and video guides
Addresses		errors in ​Addresses and ​Relation:associatedStreet.
	House number without street	objects that have an addr:housenumber tag, but neither addr:street nor addr:place. The street name can also be provided using an associatedStreet relation or on interpolation way.	Add the missing street name information.
	Duplicate house numbers	two members of an associatedStreet relation have the identical house number.	Make sure different buildings have different house numbers. Ignore this warning, if two buildings really have the same house number.
	Multiple street names in relation	name tag of an associatedStreet relation matches the name tags of the members with role street and the addr:street tag of the members with role house.
	House number too far from street	the houses of an associatedStreet are far away from the corresponding street.	Verify that the house really belongs the the street that is given by the relation.
	Multiple associatedStreet relations	an object is in more than one associatedStreet relation.
Barriers and entrances		errors in ​Barriers and ​Key:entrance.
Coastlines		​Coastline are correct.
Conditional Keys		usage of *:conditional tags.	Imprecise rules covered at ​osm wiki page "Conditional restrictions"
Crossing barriers / boundaries / ways
	Crossing ways	ways (with highway/railway/waterway tags) that crosses in same layer with no crossing node	1. ​(video) usually you need to add a common node or 2. add appropriate ​Key:layer (and possibly ​Key:bridge or ​Key:tunnel)
Duplicated nodes
	Duplicated nodes	no nodes in the very same location	Merge the nodes into only one, adding the properties from all nodes to the merged one
Duplicated relations		no relations with same tags and same members with same roles.
Duplicated ways		no ways with same node coordinates and optionally also same tags.
Duplicated way nodes		ways with identical consecutive nodes.
Highways		semantic checks on highways.
Lane tags		lane: tags.
Tag checker (MapCSS based)		errors in tag keys and values.
Multipolygon		multipolygons are valid.
Missing name:* translation		finds multilingual objects whose name attribute is not equal to some name:* attribute and not a composition of name:* attributes, e.g., Italia - Italien - Italy.
Opening hours syntax		correct usage of the opening hours syntax.	​common OH examples ​common mistakes ​complete OH spec
Overlapping ways		a connection between two nodes is not used by more than one way.	​(video) Using selection, split and middle mouse
	Overlapping (high)ways two (high)	ways that share the same nodes
Power lines		nodes in power lines that do not have a power=tower/pole tag.
Relation checker		errors in relations.
Self-intersecting ways		ways that contain some of their nodes more than once.
Similarly named ways		ways with similar names that may have been misspelled.
	Similar named ways	ways with very similar names, possibly a typo	Fix names or ignore false warning
Tag checker		errors in tag keys and values.
Turnrestrictions		​turn restrictions are valid.
	Unknown role	the role for members of a turn restriction relation is either from, to (ways) or via (nodes and ways)
	Unknown member type	only nodes and ways (and not relations) are members of a turn restriction relation.
	No "from" way found No "to" way found No "via" node or way found	all necessary elements of a turn restriction relation are present.
	More than one "from" way found More than one "to" way found More than one "via" node found	at most one way with role from and to and at most one node with role via in a turn restriction relaion.
	Cannot mix node and way for role "via"	there is either a "via" node or multiple "via" ways, but not a mix of nodes and ways with role via.
	The "from" way does not start or end at a "via" node. The "to" way does not start or end at a "via" node. The "from" and the first "via" way are not connected. The "via" ways are not connected. The last "via" and the "to" way are not connected.	the different parts of a turn restriction relation are connected. is also aware of oneway streets and considers parts unconnected, if they cannot be traveled in the intended order due to the oneway restriction.	Make sure that consecutive member of a turn restriction relation are connected. (Ways must be connected end-to-end.)
	Superfluous turnrestriction as "to" way is oneway	The turn restriction is not needed, because the corresponding turn would mean to enter a oneway street from the wrong side.	Verify that the "from" and "to" ways are correctly assigned and delete the relation if it is indeed superfluous.
Unclosed Ways		ways which should be circular are closed.
Unconnected highways / natural lands and landuses / power ways / railways / waterways		a way has an endpoint very near to another way.
Untagged and unconnected nodes		untagged nodes that are not part of any way.	1. If it is yours node, you are to decide if to remove it otherwise 2. Download parent relations and contact mappers who added these nodes in unclear cases
Untagged, empty and one node ways		untagged, empty and one node ways.
Way connected to Area		ways connected to areas.
Wrongly Ordered Ways		direction of water, land and coastline ways.
Uncategorized		Descriptions that need to be checked, updated and added to one of the categories above.
	Duplicated way nodes	ways contain no loop edges (i.e., a single step from a node to itself)	Split the way, and delete the way consisting of the loop edge.
	Reversed coastline: land not on left side	coastlines that are not counter-clockwise or that are otherwise misplaced (coastline misused as inland lake)	Reverse coastline
	Unconnected coastline: coastline ways do not form closed loops	coastlines ways that are not connected to the end of other coastline ways
	Unordered coastline: coastline ways are not connected start-to-end	coastline ways of which either the start is not connected to the end of another coastline or the end is not connected to the start of another coastline	Reverse coastline
	Incomplete ways	ways with zero or only one node	Removes the way
	Check property keys	misspelled property keys. See the words.cfg for file of misspelled property keys	Replace wrong key with right one
	Check property values	misspelled property values. Uses the tagging presets file for checking
	Empty properties	properties with empty values	Remove the empty properties
	Unordered ways	all segments in a way are properly ordered	Reorder the way
	Self-intersecting ways	a way crosses itself	Remove the self-crossing, remove overlapping parts or split way
	Unclosed ways	way types, which should be closed really are closed	Close unclosed ways
	Untagged ways	untagged ways	1. describe them correctly if you know this objects or 2. leave them until somebody describes them
	Way end node near other highway	End point of a way is very near to other ways	Connect the ways or when really unconnected set a 'noexit' tag to prevent further warnings
	Style for outer way mismatches	Within a multipolygon relation, one of the tags of the relation and the outer ways is shared but with different values	Copy relation related tags to the relation itself
	Style for inner way equals multipolygon	Within a multipolygon relation, one of the tags of the relation and the inner ways is shared and has the same value	Remove tag from inner way
	FIXMES	any property with the word "FIXME" inside
	Highway without a reference	there is a ​ref tag for highways that are tagged tertiary. Not always required, see for instance ​Highway	Add ref property or ignore
	Key 'x' invalid. - ...	illegal key combinations, names and similar issues
	Nodes with the same name	two nodes have equal name	Join nodes when possible, ignore otherwise
	Overlapping areas	areas overlap	Remove overlapping only when really wrong.
	Unknown propery value	proper use of tags	If it is your new tag, it is good idea document it at wiki ​Any tags you like
	No style in multipolygon relation	The multipolygon relation is missing a tag describing what it represents	For a building, add building=yes to the relation etc.

See also

• Validator dialog
• JOSM Validator Custom rules from "Tag Checker Rules"
• MapCSSTagChecker - about the syntax of validator checks, which are based on MapCSS

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